/Engine/Source/Editor/UnrealEd/Public/Subsystems/EditorAssetSubsystem.h
Call this to add a callback to extract an asset from a file, for example from a drag and drop operation.
void AddOnExtractAssetFromFile ( [FOnExtractAssetFromFileDynamic](API\Editor\UnrealEd\Subsystems\UEditorAssetSubsystem\FOnExtractAssetF-) Delegate )